ceph/src/seastar/dpdk/test/test/test_distributor_perf.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "test.h"
  35
  36 #include <unistd.h>
  37 #include <string.h>
  38 #include <rte_mempool.h>
  39 #include <rte_cycles.h>
  40 #include <rte_common.h>
  41 #include <rte_mbuf.h>
  42 #include <rte_distributor.h>
  43
  44 #define ITER_POWER_CL 25 /* log 2 of how many iterations  for Cache Line test */
  45 #define ITER_POWER 21 /* log 2 of how many iterations we do when timing. */
  46 #define BURST 64
  47 #define BIG_BATCH 1024
  48
  49 /* static vars - zero initialized by default */
  50 static volatile int quit;
  51 static volatile unsigned worker_idx;
  52
  53 struct worker_stats {
  54         volatile unsigned handled_packets;
  55 } __rte_cache_aligned;
  56 struct worker_stats worker_stats[RTE_MAX_LCORE];
  57
  58 /*
  59  * worker thread used for testing the time to do a round-trip of a cache
  60  * line between two cores and back again
  61  */
  62 static void
  63 flip_bit(volatile uint64_t *arg)
  64 {
  65         uint64_t old_val = 0;
  66         while (old_val != 2) {
  67                 while (!*arg)
  68                         rte_pause();
  69                 old_val = *arg;
  70                 *arg = 0;
  71         }
  72 }
  73
  74 /*
  75  * test case to time the number of cycles to round-trip a cache line between
  76  * two cores and back again.
  77  */
  78 static void
  79 time_cache_line_switch(void)
  80 {
  81         /* allocate a full cache line for data, we use only first byte of it */
  82         uint64_t data[RTE_CACHE_LINE_SIZE*3 / sizeof(uint64_t)];
  83
  84         unsigned i, slaveid = rte_get_next_lcore(rte_lcore_id(), 0, 0);
  85         volatile uint64_t *pdata = &data[0];
  86         *pdata = 1;
  87         rte_eal_remote_launch((lcore_function_t *)flip_bit, &data[0], slaveid);
  88         while (*pdata)
  89                 rte_pause();
  90
  91         const uint64_t start_time = rte_rdtsc();
  92         for (i = 0; i < (1 << ITER_POWER_CL); i++) {
  93                 while (*pdata)
  94                         rte_pause();
  95                 *pdata = 1;
  96         }
  97         const uint64_t end_time = rte_rdtsc();
  98
  99         while (*pdata)
 100                 rte_pause();
 101         *pdata = 2;
 102         rte_eal_wait_lcore(slaveid);
 103         printf("==== Cache line switch test ===\n");
 104         printf("Time for %u iterations = %"PRIu64" ticks\n", (1<<ITER_POWER_CL),
 105                         end_time-start_time);
 106         printf("Ticks per iteration = %"PRIu64"\n\n",
 107                         (end_time-start_time) >> ITER_POWER_CL);
 108 }
 109
 110 /*
 111  * returns the total count of the number of packets handled by the worker
 112  * functions given below.
 113  */
 114 static unsigned
 115 total_packet_count(void)
 116 {
 117         unsigned i, count = 0;
 118         for (i = 0; i < worker_idx; i++)
 119                 count += worker_stats[i].handled_packets;
 120         return count;
 121 }
 122
 123 /* resets the packet counts for a new test */
 124 static void
 125 clear_packet_count(void)
 126 {
 127         memset(&worker_stats, 0, sizeof(worker_stats));
 128 }
 129
 130 /*
 131  * This is the basic worker function for performance tests.
 132  * it does nothing but return packets and count them.
 133  */
 134 static int
 135 handle_work(void *arg)
 136 {
 137         struct rte_distributor *d = arg;
 138         unsigned int count = 0;
 139         unsigned int num = 0;
 140         int i;
 141         unsigned int id = __sync_fetch_and_add(&worker_idx, 1);
 142         struct rte_mbuf *buf[8] __rte_cache_aligned;
 143
 144         for (i = 0; i < 8; i++)
 145                 buf[i] = NULL;
 146
 147         num = rte_distributor_get_pkt(d, id, buf, buf, num);
 148         while (!quit) {
 149                 worker_stats[id].handled_packets += num;
 150                 count += num;
 151                 num = rte_distributor_get_pkt(d, id, buf, buf, num);
 152         }
 153         worker_stats[id].handled_packets += num;
 154         count += num;
 155         rte_distributor_return_pkt(d, id, buf, num);
 156         return 0;
 157 }
 158
 159 /*
 160  * This basic performance test just repeatedly sends in 32 packets at a time
 161  * to the distributor and verifies at the end that we got them all in the worker
 162  * threads and finally how long per packet the processing took.
 163  */
 164 static inline int
 165 perf_test(struct rte_distributor *d, struct rte_mempool *p)
 166 {
 167         unsigned int i;
 168         uint64_t start, end;
 169         struct rte_mbuf *bufs[BURST];
 170
 171         clear_packet_count();
 172         if (rte_mempool_get_bulk(p, (void *)bufs, BURST) != 0) {
 173                 printf("Error getting mbufs from pool\n");
 174                 return -1;
 175         }
 176         /* ensure we have different hash value for each pkt */
 177         for (i = 0; i < BURST; i++)
 178                 bufs[i]->hash.usr = i;
 179
 180         start = rte_rdtsc();
 181         for (i = 0; i < (1<<ITER_POWER); i++)
 182                 rte_distributor_process(d, bufs, BURST);
 183         end = rte_rdtsc();
 184
 185         do {
 186                 usleep(100);
 187                 rte_distributor_process(d, NULL, 0);
 188         } while (total_packet_count() < (BURST << ITER_POWER));
 189
 190         rte_distributor_clear_returns(d);
 191
 192         printf("Time per burst:  %"PRIu64"\n", (end - start) >> ITER_POWER);
 193         printf("Time per packet: %"PRIu64"\n\n",
 194                         ((end - start) >> ITER_POWER)/BURST);
 195         rte_mempool_put_bulk(p, (void *)bufs, BURST);
 196
 197         for (i = 0; i < rte_lcore_count() - 1; i++)
 198                 printf("Worker %u handled %u packets\n", i,
 199                                 worker_stats[i].handled_packets);
 200         printf("Total packets: %u (%x)\n", total_packet_count(),
 201                         total_packet_count());
 202         printf("=== Perf test done ===\n\n");
 203
 204         return 0;
 205 }
 206
 207 /* Useful function which ensures that all worker functions terminate */
 208 static void
 209 quit_workers(struct rte_distributor *d, struct rte_mempool *p)
 210 {
 211         const unsigned int num_workers = rte_lcore_count() - 1;
 212         unsigned int i;
 213         struct rte_mbuf *bufs[RTE_MAX_LCORE];
 214
 215         rte_mempool_get_bulk(p, (void *)bufs, num_workers);
 216
 217         quit = 1;
 218         for (i = 0; i < num_workers; i++)
 219                 bufs[i]->hash.usr = i << 1;
 220         rte_distributor_process(d, bufs, num_workers);
 221
 222         rte_mempool_put_bulk(p, (void *)bufs, num_workers);
 223
 224         rte_distributor_process(d, NULL, 0);
 225         rte_eal_mp_wait_lcore();
 226         quit = 0;
 227         worker_idx = 0;
 228 }
 229
 230 static int
 231 test_distributor_perf(void)
 232 {
 233         static struct rte_distributor *ds;
 234         static struct rte_distributor *db;
 235         static struct rte_mempool *p;
 236
 237         if (rte_lcore_count() < 2) {
 238                 printf("ERROR: not enough cores to test distributor\n");
 239                 return -1;
 240         }
 241
 242         /* first time how long it takes to round-trip a cache line */
 243         time_cache_line_switch();
 244
 245         if (ds == NULL) {
 246                 ds = rte_distributor_create("Test_perf", rte_socket_id(),
 247                                 rte_lcore_count() - 1,
 248                                 RTE_DIST_ALG_SINGLE);
 249                 if (ds == NULL) {
 250                         printf("Error creating distributor\n");
 251                         return -1;
 252                 }
 253         } else {
 254                 rte_distributor_clear_returns(ds);
 255         }
 256
 257         if (db == NULL) {
 258                 db = rte_distributor_create("Test_burst", rte_socket_id(),
 259                                 rte_lcore_count() - 1,
 260                                 RTE_DIST_ALG_BURST);
 261                 if (db == NULL) {
 262                         printf("Error creating burst distributor\n");
 263                         return -1;
 264                 }
 265         } else {
 266                 rte_distributor_clear_returns(db);
 267         }
 268
 269         const unsigned nb_bufs = (511 * rte_lcore_count()) < BIG_BATCH ?
 270                         (BIG_BATCH * 2) - 1 : (511 * rte_lcore_count());
 271         if (p == NULL) {
 272                 p = rte_pktmbuf_pool_create("DPT_MBUF_POOL", nb_bufs, BURST,
 273                         0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
 274                 if (p == NULL) {
 275                         printf("Error creating mempool\n");
 276                         return -1;
 277                 }
 278         }
 279
 280         printf("=== Performance test of distributor (single mode) ===\n");
 281         rte_eal_mp_remote_launch(handle_work, ds, SKIP_MASTER);
 282         if (perf_test(ds, p) < 0)
 283                 return -1;
 284         quit_workers(ds, p);
 285
 286         printf("=== Performance test of distributor (burst mode) ===\n");
 287         rte_eal_mp_remote_launch(handle_work, db, SKIP_MASTER);
 288         if (perf_test(db, p) < 0)
 289                 return -1;
 290         quit_workers(db, p);
 291
 292         return 0;
 293 }
 294
 295 REGISTER_TEST_COMMAND(distributor_perf_autotest, test_distributor_perf);